I've been in the beauty industry for over 20 years, and I've seen it all. I love breaking "the rules" — you know, those ridiculous things people say like you can't wear a dark lip and a dark eye look together, or that you have to ditch shimmer shadows over a certain age, or the idea that your hair or eye colour has to determine what makeup colours you wear. However, even a rule breaker like me has a few nonnegotiables. I love self-expression, putting your own spin on things, and all things modern, creative, and fabulous, but here are the rules you just can't ever break — because they'll hurt your health, age you, or just make you look bad.